|Número de publicación||US6886351 B2|
|Tipo de publicación||Concesión|
|Número de solicitud||US 10/642,267|
|Fecha de publicación||3 May 2005|
|Fecha de presentación||18 Ago 2003|
|Fecha de prioridad||18 Sep 2001|
|También publicado como||US6470696, US6834509, US20040050072, US20040050076, WO2003025481A1, WO2003025481B1|
|Número de publicación||10642267, 642267, US 6886351 B2, US 6886351B2, US-B2-6886351, US6886351 B2, US6886351B2|
|Inventores||Valerie Palfy, Don A. Skomsky|
|Cesionario original||Valerie Palfy, Don A. Skomsky|
|Exportar cita||BiBTeX, EndNote, RefMan|
|Citas de patentes (29), Otras citas (10), Citada por (23), Clasificaciones (41), Eventos legales (4)|
|Enlaces externos: USPTO, Cesión de USPTO, Espacenet|
This is a continuation of U.S. application Ser. No. 10/356,606, filed Feb. 3, 2003, which is a continuation-in-part application of Patent Cooperation Treaty application PCT/US02/29422, filed Sep. 18, 2002, which is a continuation of U.S. Application Ser. No. 09/953,891, filed on Sep. 18, 2001, now U.S. Pat. No. 6,470,696, and this is a continuation-in-part of Patent Cooperation Treaty application PCT/US02/29422, filed Sep. 18, 2002, which is a continuation of U.S. application Ser. No. 09/953,891, filed Sep. 18, 2001, now U.S. Pat. No. 6,470,696. The entire disclosure of each of the prior applications is hereby incorporated herein by reference.
The present invention relates to devices and methods for sensing condensation conditions and for preventing or removing such condensation from surfaces such as vehicle windscreens, eyewear, goggles, helmet visors, computer monitor screen, windows, electronic equipment, etc., and especially devices and methods that use a thermal sensor and a humidity sensor in an adjacent ambient space with respect to the surface, or in thermally conductive contact with a thermoelectric cooler (TEC), for automatically and dynamically sensing condensation conditions when condensation appears on a surface or before such condensation actually appears on a surface.
The level of moisture in air at any time is commonly referred to as relative humidity. Percent relative humidity is the ratio of the actual partial pressure of steam in the air to the saturation pressure of steam at the same temperature. If the actual partial pressure of steam in the air equals the saturation pressure at any given temperature, the relative humidity is 100 percent. If the actual partial pressure is half that of the saturation pressure, the relative humidity is 50 percent, and so forth.
Dew point temperature, also known as condensation temperature or saturation temperature, is a function of the level of moisture or steam that is present in the air, and is the temperature at which air has a relative humidity of 100 percent. Condensation of moisture on a surface occurs when the temperature of that surface is at or below the dew point temperature of air surrounding the surface.
When air having a relatively high content of moisture comes into contact with a surface having a temperature at or below the dew point temperature, steam will begin to condense out of the air and deposit as water droplets onto the surface. At this time, a thin layer of liquid water comprised of small water droplets forms on the surface, creating a visual hindrance or “fog” to an observer looking at or through the surface. Once, formed, the condensation can be dispersed and removed either by raising the temperature of the surface, thereby changing the water into steam, or by lowering the relative humidity of the air surrounding the surface, thereby allowing the droplets to evaporate.
Steam, as a gas, exists in a saturated state at pressures and corresponding temperatures that are predictable and measurable. Notably, the standard for steam's thermodynamic properties, including saturation pressures and temperatures, in the United States and arguably the world, is the ASME (American Society of Mechanical Engineers) Steam Tables. These thermodynamic property tables are readily obtainable from ASME, as well as from engineering texts.
In that steam possesses certain characteristics and traits as a saturated gas that are measurable and exact, equations have been developed that permit the engineer to approximate and predict the properties of steam at a desired set of conditions when its properties are known at a different, or datum, set of conditions. Such an equation, in the case of gas saturation pressures and temperatures, is entitled the Clausius-Clapeyron Equation. This equation, which may be described in several variations, may be best stated for the purposes at hand in the following form:
Thus, using the Clausius-Clapeyron Equation, once steam's saturation pressure and temperature are known (the saturation pressure and temperature defining state 1 of the steam), given any other desired temperature, the saturation pressure at this temperature can be calculated to a high degree of accuracy (the temperature and calculated saturation pressure defining state 2 of the steam). Conversely, given any known state 1 conditions, for any desired saturated gas pressure, the saturation temperature can be calculated (the saturation pressure and calculated temperature defining state 2 of the steam).
The invention provides a device and method for sensing or predicting when condensation is present or imminent and for suppressing such condensation from a surface by preventing it or removing it. A first thermal sensor is in thermally conductive contact with the surface. A second thermal sensor is in an environment separated from the surface. A humidity sensor is in the environment of the second thermal sensor. A circuit causes a condensation suppression mechanism to be activated for preventing or removing condensation having the given physical state from the surface when a temperature sensed by the first thermal sensor, a temperature sensed by the second thermal sensor, and a humidity sensed by the humidity sensor indicate that a condensation condition is either present or likely and requires prevention or removal at the surface. As used herein and in the claims, the term “suppress” encompasses prevention or preclusion of condensation conditions as well as, in the alternative, removal of existing condensation conditions.
The invention provides a convenient and practical mechanism for detecting condensation conditions quickly, before they manifest themselves on the surface. In certain embodiments the condensation suppression mechanism can be activated automatically when a condensation condition is detected, thereby providing convenience and safety where the surface is a windscreen of a vehicle, for example, or goggles, a helmet visor, computer monitor screen, window, electronic equipment enclosure.
In one embodiment of the invention, the second thermal sensor is in thermally conductive contact with a cooling device, and a circuit activates the cooling device in order to maintain the second thermal sensor at a temperature that is lower than a temperature of the first thermal sensor. The humidity sensor is in thermally conductive contact with the cooling device. The circuit causes the condensation suppression mechanism to be activated when the humidity sensor indicates a presence of high humidity conditions or condensation at the temperature that is lower than the temperature of the first thermal sensor.
In alternative embodiments of the invention, the environment of the second thermal sensor is in an adjacent ambient space with respect to the surface. The circuit determines that the condensation condition requires suppression at the surface by determining, from the temperature sensed by the second thermal sensor and the humidity sensed by the humidity sensor, the pressure of steam in the environment of the second thermal sensor. Then, the circuit may either determine a ratio of the pressure of steam in the environment of the second thermal sensor to the saturated steam pressure at the temperature sensed by the first thermal sensor, or determine a difference between a temperature sensed by the first thermal sensor and a dew point temperature associated with the pressure of steam in the environment of the second thermal sensor.
Thus, in certain embodiments of the invention, instead of measuring RH at an intentionally lowered temperature relative to the surface in question, RH (and temperature) can be measured in the surrounding ambient air adjacent to and in the proximity of the surface itself. Through calculation, the measurements taken in the surrounding ambient air can be extrapolated using the Clausius-Clapeyron Equation or any of its derivatives to determine whether condensation conditions exist on the surface in question or are imminent. Thus, it is not necessary physically to create a simulated (state 2) temperature in which a (state 2) relative humidity (RH) value can be measured.
Numerous additional features, objects, and advantages of the invention will become apparent from the following detailed description, drawings, and claims.
Like reference symbols in the various drawings indicate like elements.
With reference to
Each of the thermal sensors is a thermocouple formed by the thermal fusion of two dissimilar but electrically insulated metal conductors. In particular, the thermal fusion of metal conductors 3 and 4 forms thermal sensor 2 and the thermal fusion of metal conductors 3 and 7 forms thermal sensor 6. Conductors 4 and 7 are of the same electro-conductive material and are of the same length.
If the temperatures of the bodies sensed by thermal sensors 2 and 6 are exactly the same, the thermocouple circuit through conductors 4 and 7 creates no electrical current. If the temperatures are not identical, a current is generated through this thermocouple circuit through conductors 4 and 7, this current being proportional to the temperature difference of the two thermocouple junctions, as was first discovered by Thomas Seebeck in 1821.
The integrated sensing and condensation prevention and removal device creates an intentional temperature difference between thermocouples 2 and 6 by the thermoelectric cooling effect of a thermoelectric cooler (TEC) onto which thermocouple 6 is mechanically affixed.
With reference to
With reference to
With reference to
The integrated sensing and condensation prevention and removal device is operated in a manner such that a constant difference is dynamically maintained between the temperature established at thermal sensor 6 by the action of TEC 8 and the temperature measured at the surface by thermal sensor 2. Therefore, regardless of the temperature of the surface, the temperature established at the cold-side face of TEC 8 onto which thermal sensor 6 is affixed will always be lower than that of the surface by a predetermined amount.
Ambient air or outside air flows over thin-film capacitive sensor 13. The capacitance of capacitive sensor 13 will be proportional to the relative humidity of the surrounding air. Because capacitive sensor 13 is maintained at a temperature less than that of the windscreen, goggles, helmet visor, computer monitor screen, window, electronic equipment enclosure, or other surface, the humidity level sensed will always be greater than that at the surface, and any liquid condensation will always form on capacitive sensor 13 before it forms on the surface.
Thin-film capacitive sensor 13 is connected by conductors 22 and 23 to capacitance-to-voltage circuit 29. Conductor 23 and capacitance-to-voltage circuit 29 are connected to a common electrical ground 40. Capacitance-to-voltage circuit 29 is supplied regulated 2.5-volt DC power by conductor 27 from voltage regulator circuit 26, which is in turn energized by an electrical power source and an electrical ground 28. Capacitance-to-voltage circuit 29 includes two #7556 timing integrated circuits 30 and 33, resistors 34, 35, 37, and 39, and filter capacitors 31, 38, and 41. Timing integrated circuits 30 and 33 are electrically grounded at junctions 32, 36, 42, and 44.
Capacitance-to-voltage circuit 29 transforms the constant 2.5-volt DC supply voltage into a high-frequency AC signal. Thin-film capacitive sensor 13 is integrated into capacitance-to-voltage circuit 29 in a manner such that any capacitance of capacitive sensor 13 is transformed into a positive DC voltage relative to ground 44, at conductor 43 of capacitance-to-voltage circuit 29. The capacitance of capacitive sensor 13 increases as humidity increases, thereby resulting in an increased voltage at conductor 43. The capacitance of capacitive sensor 13 is at a maximum when liquid moisture condenses onto capacitive sensor 13. This condensation of liquid moisture onto capacitive sensor 13, occurs when the temperature of capacitive sensor 13 is at or below the dew point of the ambient air.
With reference to
If the signal from the capacitance-to-voltage circuit is equal to or greater than the pre-established set point, an electrical signal is directed to switching circuit 50 through conductors 48 and 49, thereby causing the internal electronic or mechanical contactors of switching circuit 50 to close. Thereafter, electrical power is directed from switching circuit 50 through conductor 51, which branches into conductors 53 and 54. Conductor 53 is connected to a single-speed or multiple-speed fan 55 located within duct 58. When fan 55 is energized, it rotates or increases its speed in order to generate or increase the volume of airflow directed toward the windscreen, goggles, computer monitor screen, window, electronic equipment enclosure, or other surface. The TEC, the thermal sensor mechanically bonded thereto, and the capacitive sensor are positioned within duct 58 upstream of fan 55.
According to a second option (Option 2), electrical power is applied by conductor 54 to an electric motor or solenoid actuator 60, which is electrically grounded by ground 61. Electric motor or solenoid actuator 60 is connected by linkage arm 63 to damper 62, which moves as indicated in
As a further option, the hot side face of the TEC may be used to provide heat, in lieu of the heating coil 57 or heater core 64, to the air flowing toward and onto the face of the surface, thereby precluding condensation, or alternatively if condensation is present, vaporizing water droplets deposited thereon.
As yet a further option, since there will not be any ductwork per se in a helmet or goggles, or within certain other equipment having surfaces to be defogged, fan 55, heating coil 57 and heater core 64 may be replaced by a heating coil embedded in or on the visor, etc., as micro-fine electro-resistive wires, or by an infrared source positioned so as to radiate onto the surface.
With reference to
With reference to
As schematically shown, the sensors may each be a thermocouple, formed by the fusion of two dissimilar metal conductors, a resistance temperature detector (RTD), a thermistor, or any electronic thermal measurement device performing the same function. Thermal sensor 68 is electrically connected to conductors 69 and 70, while thermal sensor 71, positioned adjacent to and in close proximity to surface 66, at distance 72, in the ambient surroundings 67, is electrically connected to conductors 73 and 74. Additionally, a humidity sensor 75, illustrated as a thin-film capacitive relative humidity sensor, but which may be any other sensing device that performs a similar function is positioned immediately adjacent to thermal sensor 71, but also may be mechanically affixed to or otherwise mechanically attached to thermal sensor 71, it also being in close proximity to surface 66, at distance 72, in the ambient surroundings 67. Capacitive sensor 75 is electrically connected to conductors 76 and 77.
With reference to
With reference to
Similarly, the resistance of thermal sensor 82, and hence the voltage across thermal sensor 82, is proportional to the temperature of surface 83, resulting in a finite voltage input to ADC 96 through conductor 94 relative to ground 95. ADC 96 is supplied power through conductor 106 by a voltage regulator circuit 105 that is connected to a DC power source.
Ambient air or outside air flows over thin-film capacitive sensor 80 in the ambient space 81. The capacitance of capacitive sensor 80 is proportional to the relative humidity of the surrounding air. Thin film capacitive sensor 80 is connected by conductors 97 and 98 to the capacitance-to-voltage circuit 99, the relative humidity level thus resulting in a finite voltage input to ADC 101 through conductor 100 relative to ground 102. The capacitance-to-voltage circuit 99 is supplied power through conductor 108 by a voltage regulator circuit 107 that is connected to a DC power source. ADC 101 is supplied power through conductor 110 by a voltage regulator circuit 109 that is connected to a DC power source.
Alternatively, a single voltage regulator connected to conductors 104, 106, and 110 and a single DC power source be may used instead of individual voltage regulators 103, 105 and 109.
The voltage level across ambient space thermal sensor 79 is converted in ADC 92 to a digital signal, thereafter being appropriately modified to account for any sensor error or non-linearity, as necessary, by calibration data 111. Similarly, the voltage level across surface thermal sensor 82 is converted in ADC 96 to a digital signal, thereafter being appropriately modified to account for any sensor error or non-linearity, as necessary, by calibration data 112. The voltage level across the output conductor 100 relative to ground 102 of the ambient space relative humidity sensor circuit 99 is converted in ADC 101 to a digital signal, thereafter being appropriately modified to account for any sensor error or nonlinearity, as necessary, by calibration data 113.
Internal timer 114 sets the period of data sampling (or data polling) for sample-and-hold buffers 115,116, and 117, such that the acquisition of temperature and relative humidity data occurs concurrently. Each buffer may be configured to retain such data in flash memory or in a stack arrangement, such that the newest data replaces the data previously recorded. Subsequently, digital measurement data of ambient space temperature, surface temperature, and ambient space relative humidity are input to central processing unit (CPU) 118 for analysis. CPU 118, which retains a pre-programmed digital instruction set, accesses a set-point database 119 during computation to establish whether condensation preclusion or removal action is indicated. In such an event, CPU 118 initiates a signal-to-switching circuit 120, thereby causing internal electronic or mechanical contactors to close. Thereafter, DC electrical power relative to ground 122 is directed from switching circuit 120 through conductor 121 thus energizing components downstream.
With reference to
According to a further option (Option 4), electrical power is supplied by conductor 124 to an electric motor or solenoid actuator 130, which is electrically grounded by ground 131. Electric motor or solenoid actuator 130 is connected by linkage arm 133 to damper 132, which moves as indicated in
According to a further option (Option 5), electrical power is supplied by conductor 124 to TEC controller circuit 136, which is electrically grounded by ground 128. TEC controller circuit 136 subsequently energizes TEC 138, through electrical conductors 139 and 140. TEC 138 is positioned relative to duct 129 such that its cold side face directly contacts the exterior surface of, and is mechanically attached, bonded, or otherwise affixed to duct 129. In the same location, heat sink 141 is mechanically attached, bonded or otherwise affixed to the inside surface of duct 129. Heat sink 141 is comprised of a thermally conductive material, which may be constructed with fins, protrusions, or similar extensions, as illustrated. Duct 129 extends past TEC 138 and heat sink 141, thereafter attaching to a 180-degree elbow 144 of the same cross-sectional area and dimensions as duct 129, and positioned within the same plane. Thereafter, elbow 144 attaches to a further duct 143, of the same cross-sectional area and dimensions as duct 129, and is positioned within the same plane as the distal end of elbow 144. Duct 143 extends parallel to duct 129 such that it extends past TEC 138 as illustrated. The hot side of TEC 138 directly contacts the exterior surface of, and is mechanically attached to, bonded to, or otherwise affixed to duct 143. In the same location, heat sink 142 is mechanically attached to, bonded to, or otherwise affixed to the inside surface of duct 143. Heat sink 142 is comprised of a thermally conductive material, which may be constructed with fins, protrusions, or similar extensions, as is illustrated.
In addition to energizing TEC controller 136, switching circuit 120 also concurrently energizes a single-speed or multi-speed fan 125 through conductor 123. Fan 125 is located within duct 129 and is electrically grounded by ground 126. When fan 125 is energized, it rotates or increases its speed in order to generate or increase the volume of airflow directed through duct 129, the airstream flowing past and through TEC cold side heat sink 141, causing moisture in the airstream to be condensed into droplets 145 and to be removed and thereafter past and through TEC hot side heat sink 142, so as to be re-heated and directed toward the surface, thus directing warmed and dehumidified air toward the surface so as to provide condensation suppression action. Water droplets 145 pass to the lower interior surface of elbow 144 in which an opening and drain trap 146 are affixed. Drain trap 146 is constructed with a loop seal so that air passing through duct 129 and elbow 144 are precluded from escaping through trap 146 by the coalesced condensate 147 collected therein. As further moisture droplets 145 are created that then pass to elbow 144 and into trap 146, the increased volume of condensate 147 within trap 146 causes a hydraulic pressure imbalance, resulting in the ejection of condensate, as is illustrated.
A further illustrative embodiment of a condensation detection and suppression system is shown in FIG. 12. Goggles 148 may be intended for underwater use such as by swimmers, but may also be of the type used by construction workers, carpenters, skiers, hazardous materials workers, the military, pilots, etc. Goggles 148 have a transparent faceplate 149, whose inner surface is to be monitored for defogging purposes, and have a circular hole 150 cut out of upper horizontal seal 151. A sensor circuit board 152, positioned in an inverted fashion and containing a humidity sensor and a temperature sensor, is mounted to the underside of a main circuit board 154. The humidity sensor and temperature sensor reside within a protective enclosure 153, which may be fabricated in part out of a hydrophobic material, so as to permit the transference of gases across its boundary but be impermeable to liquid water. Sensor circuit board 152 and protective shroud 153 extend beneath and protrude below the bottom plane of hermetically sealed enclosure 155 such that, when enclosure 155 is affixed to goggles 148 thus mating with upper horizontal seal 151, circuit board 152 and protective shroud 153 insert within hole 150. In such a position, the humidity and temperature sensors (and protective shroud) are placed within the enclosed ambient space formed by the goggles' inner surfaces and the wearer's face.
Main circuit board 154 also contains CPU 156, voltage regulators 157, ADC's 158, and integrated switching mechanism 159. Batteries 160 and 161, positioned within cylindrical recesses 162 and 163, supply direct-current electrical power to main circuit board 154 and sensor circuit board 152. Gasketed threaded end caps 164 and 165 provide hermetic sealing of battery enclosures 162 and 163 respectively.
With reference to
In a second alternative, the CPU computes or determines, through direct calculation (using the Clausius-Clapeyron Equation or any of its derivatives), by accessing an internal look-up table or by sequentially accessing a look-up table and interpolating or extrapolating and calculation, the theoretical saturated steam pressure in the ambient space at the ambient space temperature provided to the CPU. Thereafter, the CPU multiplies this ambient space saturated steam pressure value by the ambient space relative humidity level supplied to it, so as to determine the actual partial pressure of steam in the ambient space. Thereafter, the CPU computes or determines, through direct calculation (using the Clausius-Clapeyron Equation or any of its derivatives), by accessing an internal look-up table or by sequentially accessing a look-up table and interpolating or extrapolating and calculation, the dew-point temperature of the ambient space steam partial pressure. This value is subtracted from the temperature of the surface, to result in a “pseudo dew point difference” value. Finally, if the CPU-computed value is within the bounds or constraints of the database, no action is taken to preclude condensation conditions or remove condensation on the surface. The device then nulls input data values, returns and re-polls the sample and hold buffers, and performs a further computational analysis as previously described. In the event that the value is outside the bounds or constraints of the database, action is taken to preclude condensation conditions and/or remove condensation on the surface. For example, if the value is greater than about seven, condensation is not likely, and no action is required. If the value is zero or less, then condensation either exists on the surface being monitored or is imminent, and defogging action is initiated. If the value is between zero and about seven, condensation is likely, and preclusive defogging action is initiated. While this action continues, the device nulls input data values, returns and re-polls the sample-and-hold buffers, and performs a further computational analysis as described. Condensation preclusion and/or removal action continues until such time that the difference between the ambient space dew-point temperature and surface temperature is within the bounds or constraints of the set-point database.
There have been described devices and methods for sensing condensation conditions, and for preventing and removing such condensation from surfaces. It will be apparent to those skilled in the art that numerous additions, subtractions, and modifications of the described devices and methods are possible without departing from the spirit and scope of the appended claims. For example, instead of the condensation preclusion and/or removal mechanisms being activated directly by the circuitry disclosed herein, the circuitry could provide a warning to a user of a vehicle that includes the windscreen, the goggles, the helmet that includes the visor, the computer monitor that includes the screen, the room or enclosure that includes the window, the electronic equipment that includes the enclosure, etc., thereby causing the condensation preclusion and/or removal mechanism to be activated by the user.
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|Clasificación de EE.UU.||62/140, 62/3.4, 62/150|
|Clasificación internacional||G05D22/02, G01N25/68, H05B3/84, G01N25/56, B60H1/00, F24F11/00, A42B3/24, B60S1/08, G05D27/02, F25B21/02, F25D21/02, F25D21/04, F25B47/00|
|Clasificación cooperativa||A42B3/24, F25D21/04, H05B2203/035, G01N25/56, F25D21/02, H05B3/84, G01N25/68, H05B1/0236, F25B21/02, G05D27/02, F24F11/0015, F24F2013/221, G05D22/02, F24F11/0012, B60H1/00785, F25B47/006|
|Clasificación europea||H05B3/84, A42B3/24, B60H1/00Y5H, F25B21/02, G01N25/56, G05D22/02, G05D27/02, F24F11/00R3B, G01N25/68|
|21 Oct 2008||FPAY||Fee payment|
Year of fee payment: 4
|26 May 2011||AS||Assignment|
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